The improved strategy can defense both common port-scanning and the secret scanning with the symbol of SYN.

这种改进方案不仅能有效防御常规的端口扫描，也能有效防御syn隐蔽扫描。

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Port scanning attack.

端口扫描攻击。

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As described earlier, a single pass of either the host or port scanning information is only useful for the instant in time when the scan was executed.

如前所述，如果只进行一次扫描，那么主机或者端口扫描信息仅在执行该次扫描的时候是有用的。

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Analysts at firms including Symantec (nasdaq: SYMC - news - people ) say an increased amount of traffic on TCP Port 445 may be the result of potential intruders scanning computers for weaknesses and that similar scans have preceded the release of other Internet worms.

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